JS: Random Array Element, Randomize Array 🚀

Get a Random Element from Array

/*
xah_get_random_array_item(arr) return a random item of a array.
http://xahlee.info/js/js_random_array.html
Version 2020-10-01
*/
const xah_get_random_array_item = ((ar) => (ar[Math.floor(Math.random() * ar.length)]));

Randomize Array

/*
xah_randomize_array(arr) Fisher-Yates shuffle array elements, return it.
Modify array inplace. Can be used on array-like object.
http://xahlee.info/js/js_random_array.html
version 2017-09-18
*/
const xah_randomize_array = ((arr) => {
  let i = arr.length - 1;
  let j;
  while (i >= 1) {
    // random element up to i, include i
    j = Math.floor(Math.random() * (i + 1));
    [arr[i], arr[j]] = [arr[j], arr[i]];
    i--;
  }
  return arr;
});

〔see Array How-To〕